improving the system is gonna cost extra... unless you count overclocking.
Is it mainly a gaming system?
If so spend more money on the Graphic card. You don't need more CPU power and the RAM is plenty. everything else is also good enough (if a 64gb SSD is good enough for your needs)
If i may suggest something:
Check out this case. It's 27 dollars more, but it looks fantastic. I am going to buy it my self sometime soon. To me it look way better than your current case
---------- Post added at 09:46 PM ---------- Previous post was at 09:44 PM ----------
ohhh: here is the link:
NZXT H440 (Red/Black) ATX Mid Tower Case (CA-H440W-M1) - PCPartPicker United Kingdom